* Drink one whenever Issei does something perverted, especially if he mentions anything about breasts ('''WARNING: YOU WILL NOT MAKE IT TO THE END OF VOLUME 1'''). Drink twice if it's not him.* Drink one whenever Issei gets a shiny new power up thanks to Rias' breasts.* Drink one whenever Irina's wings flicker from angel to fallen angel.* Drink one whenever the church trio (Asia, Xenovia, and Irina) pray to God. Take another shot if either of the first two get a headache as a result.* Drink one whenever Akeno teases Issei.* Drink one whenever Issei makes a FirstPersonSmartass comment. Drink twice if it's [[SwitchingPOV Kiba or Azazel.]] [[spoiler: [[UnexpectedCharacter Or Fenrir.]]]]* Drink one whenever anyone [[MomentKiller kills a moment.]] Drink twice if it's Ophis.* Drink one whenever Koneko [[LittleMissSnarker makes a snarky comment.]]* Drink one whenever [[HeroicSelfDeprecation Issei starts ranting about himself.]] Drink twice if [[YouAreBetterThanYouThinkYouAre at least one of his haremettes tries to comfort him.]]* Drink one whenever Issei gets either MarshmallowHell or a LapPillow by the ladies.* Down one bottle whenever either [[ButtMonkey Ddraig or Albion]] get into another one of their HeroicBSOD moments.